Blowpipe.



J. McV. MORRIS.

BLOWPlPE.

APPLICATION FILED JULY 10. 1914.

& Patented. May 11, 1915.

THE NORRIS PETERS CO. F'HDTc-LI7Ho., wasmlvurolv, I). u.

warren snares PATENT @FFTQE JOHN MQVICKER MORRIS, OF LONDON, ENGLAND, ASSIGNOR, TO THE OARBIC CORPORA- TION, OF DULUTH, MINNESOTA.

BLOWPIPE.

Application filed July 10, 1814.

To all whom it may concern Be it known that I, JOHN McVrcxnn Monnis, a subject of the King of Great Britain, residing at 51 Holborn Viaduct, in the city and county of London, England, have invented certain new and useful Improvements in Blowpipes, of which the following is a specification.

This invention relates to blow-pipes, intended particularly for autogenous welding, the chief object being to provide a compact handy appliance of simple construction adapted, by means of the flame of a combustible mixture of gases, to apply a strictly localized but very intense heating to the abutting surfaces or edges of the articles to be Welded.

According to the present invention the portion of the blow-pipe through which the gases to be mixed enter the mixing chamber is formed with two gas passages one of which terminates in an axially perforated detachable cone the base of which overlaps, without however closing, the orifice or outlet port of the other passage and leaves an annular space between its periphery and the wall of the mixing chamber to permit the gas issuing from the said orifice or outlet port to spread beneath the base and thence stream through the said annular space into the mixing chamber. The mixing chamber itself is also detachable. The gas under pressure, or if both gases are under pressure, the gas under the higher pressure, is supplied through one of the gas passages and through the axial perforation or passage of the cone and has an inducing action upon the other gas, which is supplied through the other gas passage and impinges upon the base of the cone and then spreads outward and over the conical surface of the same. In the case of producing an oxyacetylene flame, oxygen under a high pressure would be supplied through one of the gas passages to the axial passage in the cone, and the acetylene at atmosphereic pressure would be drawn by induction through the other gas passage. The mixed gases issue from the mixing chamber and pass through a delivery tube to a delivery nozzle detachably secured to the end of the tube. The cone, the mixing chamber, and the delivery nozzle are detachable, as already stated, so that they can be removed Specification of Letters Patent.

lPatented May it, 1915.

Serial No. 850,254.

and replaced by others having finer or coarser perforations, as may be desired.

in order that the invention may be clearly understood and readily carried into effect, the same will now be described more fully with reference to the accompanying drawings, in which Figure 1 is an elevation; Fig. 2 a longitudinal section; and Fig. 3 a cross section on the line 33 of Fig. 1, showing one constructional form of the blow pipe. Fig. 1 is another view of the delivery tube and nozzle alone and in a different position.

A is the body portion or handle of the blow-pipe, B is the mixing chamber, C is the delivery tube and C the delivery nozzle. Through the handle A pass two gas supply pipes the front ends of which are screwed or otherwise'secured into the front end of the handle while the rear ends project, as at a, o to enable connections to be made with the respective gas supplies. The gas under pressure, or under the higher pressure (oxygen for example), passes through the front end of the handle A by way of the rectilinear passage A, and the gas at atmospheric or a relatively low pressure (acetylene for example) passes by way of the rectilinear passage A Into the passage A is screwed the stem of the cone D having the fine axial passage (Z. The gas issuing from the passage (Z into the domeshaped interior of the mixing chamber B has an inducing effect upon the gas supplied through the passage A and the latter gas, after being baflied and deflected by impinging upon the base of the cone D and thence spreading laterally outward and flowing over the periphery and then over the surface of the cone, mixes with the former gas. The mixture issuing from the small outlet 5 enters the delivery tube G and escapes as a fine jet from the delivery nozzle C. It will be observed that the cone D, the mixing chamber B, the delivery tube C, and the nozzle C, are all detachable so that they can readily be removed and others be sub stituted.

The blow-pipe above described is particularly intended for the class of work in which an easily regulated but intense flame of very small size is required, as is the case in welding metals of low melting point, such as l a l, The passages in the cone D and the nozzle C are therefore very small, and in order that they may not be enlarged during cleaning out of the same by means of a pin or other sharp instrument of unsuitable dimensions, it is advantageous to provide a special wire of the right diameter for cleaning purposes. This wire may conveniently be carried in the handle A; in the drawings is shown a thumb screw E attached to one end of the wire and screwed into the handle so that the wire may be ready to hand and easy to manipulate, when required.

l/Vhat I claim and desire to secure by Letters Patent of the United States is 1. A blow-pipe, comprising a gas mixing chamber, a body portion or handle having two gas passages therein through which the gases to be mixed are supplied to the mixing chamber, and an axially perforated cone detachably mounted in the outlet port of one gas passage with its base completely overlapping, without however closing, the outlet port of the other passage and leaving an annular space between its periphery and the internal wall of the mixing chamber, the gas issuing from the latter passage being thus bafflecl and deflected toward the said annular space.

2. A blow-pipe, comprising a gas mixing chamber, a body portion or handle having two gas passages therein through which the gases to be mixed are supplied to the mixing chamber, an axially perforated cone detachably mounted in the outlet port of one gas passage with its base completely overlapping, without however closing, the outlet port of the other passage and leaving an annular space between its periphery and the internal wall of the mixing chamber, the gas issuing from the latter passage being thus baflied and deflected toward the said annular space, a delivery tube detachably connected to the mixing chamber, and a nozzle detachably connected to the end of the delivery tube. Y

3. A blow-pipe, comprising a gas mixing chamber, a body portion or handle having two rectilinear passages therein through which the gases to be mixed are supplied to the mixing chamber, an axially perforated cone detachably mounted in the outlet port of one gas passage with its base completely overlapping, without however closing, the outlet port of the other passage and leaving an annular space between its periphery and the internalwall of the mixing chamber, the gas issuing from the latter passage being thus baffled and deflected toward the said annular space, a delivery tube detachably connected to the mixing chamber, and a nozzle detachably connected to the end of the delivery tube.

4. A blow-pipe for use with two gases at different pressures, comprising an externally cylindrical internally dome-shaped gasmixing chamber, a cylindrical body portion or handle detachably connected to the gas mixing chamber and having two rectilinear passages through which the gases are conveyed to the base of the dome-shaped mixing chamber, gas supply pipes projecting from the rear end of the body portion or handle and in continuation of the said rectilinear gas passages, an axially perforated cone mounted. axially in the outlet port of the gas passage through which the gas at the higher pressure passes, the base of the cone overlapping, without however closing, the outlet port of the other gas passage but leaving an annular space between itsperiphery and the wall of the dome-shaped cavity, a

delivery tube detachably connected to the mixing chamber, and a nozzle detachably connected to the end of the delivery tube.

In testimony whereof I affix my signature I in presenceof two witnesses JOHN MGVICKER MORRIS.

Witnesses: T. SELBY WARDLE, WALTER J. SKERTEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, I). G. 

